Skiving machine



1954 E. H. BECK 2,687,634

sxxvmc MACHINE Filed April 23, 1953 5 sh t -sh t 1 INVENTOR, i Eownv H.BECK,

Aug. 31, 1954 5 E 2,687,634

SKIVING MACHINE Filed April 23. 1955 3 Sheets-Sheet 2 VFIQZ. $25

' .Z'NVENTOR, EDWIN H. BECK,

ATTORNEYS.

Aug. 31, 1954 E. H. BECK SKIVING MACHINE 3 Sheets-Sheet 5 Filed April23, 1953 FIG. 4.

FIGS.

7 a we a 1 J a l 6 INVENTOR, EDWIN H. BECK.

A TTORNEYS.

Patented Aug. 31, 1954 SKIVING MACHINE Edwin H. Beck, Lemay, Mo.,assignor to Mann-- facturers Supplies 60., St. Louis, Mo., a corporationof Missouri Application April 23, 1953, Serial No. 350,672

12 Claims.

This invention relates to skiving machines, and particularly to machinesfor use in skiving the margins of shoe parts.

In the manufacture of shoes, it is frequently necessary to provide ablank with several scarfs of different shape. In the case of a shoeupper, for example, a relatively flat, folding cut is made along the topmargin for hemming purposes; a gentle bevel is made along the bottomedge where the quarter is secured to the vamp; and a rather steepslanting cut is made along the back edge where the heel or counterpartof the shoe is formed.

The machine commonly employed for such skiving is of a type wherein thework is fed between a resiliently-mounted feed roller and a relativelyfixed presser foot against the edge of a rotating cylindric knife. Inmaking marginal cuts, the surface of the feed roller and the opposedsurface of the presser foot are in general but not necessarily exactparallelism with the upper cutting part of the rotating knife. Theposition of the presser foot relative to the knife edge determines thecharacter of the scarf, the presser foot being adjustable in elevationto vary the depth of the cut and being angularly adjustable to vary theslant of the cut. In preparing a part, such as the above-described shoeupper, the practice heretofore has been to employ three machines, eachof which is set to make a different cut, or the practice has been one ofmaking three different runs on the same machine, with the presser footbeing reset between each run. In either case, a given piece of work ishandled several times and there is a lack of flexibility in the over-alloperation.

It is accordingly an object of the present invention to provide askiving machine of the character described, which substantiallysimplifies the handling operations and which offers greater flexibility.More particularly, the invention contemplates a machine that permits anoperator to make several different cuts without substantially liftingthe piece from the machine or in any way adjusting the machine except byrelatively quick treadle action.

To these ends I propose that the skiving machine be provided with anupper actuating lever for varying the elevation of the presser foot anda lower actuating lever for varying the angle of the presser footrelative to the cutting edge of the knife. These actuating levers aremounted for vertical movement and are in turn under the control of atleast one, and preferably two, treadle-actuated members, which aremounted for vertical movement from retracted positions to predeterminedactuated positions. Adjustablypositionable lever-engaging elements oneach of the treadle-actuated members engage the levers and reset thepresser foot on manipulation of either member to its predeterminedactuated position. In a preferred form of the invention, the presserfoot is pivotally carried upon the lower end of a vertically movablesupport, the upper actuating lever is pivoted adjacent the upper end ofthis support for cooperation therewith,

and the lower lever i fixed to the presser foot.

In use, the machine is adjusted in the usual manner to make a rathershallow and flat cut. The lever-engaging elements are then adjusted toactuate the levers and reposition the presser foot for making cuts ofdifferent slope and depth.

Other features of the invention will be in part apparent from and inpart pointed out in the following detail description taken in connectionwith the accompanying drawings, in which:

Fig. 1 is an end elevational view of a skiving machine incorporating themechanism of this invention;

Fig. 2 is a top plan view of the apparatus shown in Fig. 1;

Fig. 3 is a diagrammatic view of the skiving machine, showing themechanism of this invention;

Fig. 4 is a detail view of the feed roller and presser foot,illustrating one type of cut;

Fig. 5 is a view similar to that of Fig. 4 showing an alternative typeof cut;

Fig. 6 is a view like that of Fig. 4, showing still another cut and,

Fig. '7 is a fragmentary sectional view illustrating details of thepresser foot and its supporting member.

Referring to the drawings, there is shown a skiving machine of a type ingeneral use. The machine includes a housing I, which functions as aframe enclosing certain operating parts, and which is secured on aworkbench partially shown at 3. A cup-like knife 5 is mounted within thehousing at one end of a driven shaft 1, which extends longitudinally ofthe machine. As indicated at 9, an upper cutting part of the knifeprojects endwise from the upper surface of the housing so that work maybe fed thereto in a direction indicated by the arrow. Immediately belowthe cutting area 9, there is a roller H mounted with its axis transverseto the knife axis. This roller may have an emery surface for relativelyfine work or a knurled surface for relatively heavy work, the surfacebeing curved in the axial direction so as to fit the curve of the knife.

The work piece is guided by means of a member l2, generally called apresser foot, which is mounted above the feed roller ll adjacent thecutting part 9 of the knife. While the details of the mechanism formounting and driving the feed roller are only partially shown herein,they being known in the art, it will be understood that the feed rolleris resiliently mounted for both tilting and radial movement in responseto movement of the work piece beneath the pressure foot. For example,the feed roller may be carried in a yoke (partially shown at I3) whichis pivoted along a pair of horizontal axes, one extending transverselyand the other parallel to the roller axis to permit both downward andtilting movement of the roller H. Springs attached to the frame and yokebias the roller upwardly toward the presser foot.

The feed roller is coupled by a driving shaft member through a universaljoint (not shown) to a transverse shaft ii. This shaft I7 is connectedat a box it? to a lateral shaft 2|, which extends across the rear of themachine. Shaft it in turn is belt-connected at 23 to the knife shaft i,both are driven from a belt drum 25.

While the machine may also include a grinding wheel for sharpening theouter surface of the knife and a scrap remover within the knife togetherwith various adjustments for the sharpening wheel, scrap remover, knifeand feed roller, these are omitted for purposes of clarity. Also, aguide cover plate 2'1 shown in Fig. 2 is omitted from the'shcwing ofFig. 1 for purposes of clarity.

In operation, the guide surface 2d of the presser foot functions toguide materia1 against the knife edge 9, the feed roller i l yielding anamount sulficient to accommodate the work while providing a drivingengagement with the work. The character of the out is determined by theposition of the guiding surface 29 of the presser foot relative to thecutting part 9 of the knife.

In accordance with this invention, the presser foot 52 is pivotallymounted upon the lower end of a plunger 3!. Fig. 7, an extension 35; onthe lower end of the plunger carries a ball thrust bearing 32, and thepresser foot i2 is mounted against the bearing on a pivot pin 35:5,which may be removably secured, as by a clip member 35, in order topermit replacement of the presser foot. The plunger (ii is slidablyreceived within a column 35 over the feed roller and is biased upwardlyby means of a spring 31', which abuts against a capv 39 screwed into theupper end of the plunger 3|. The lOWer end of the spring 3'5 seatsagainst a screw 5! fixed in the column 35 and slidably received througha slot 53 in the plunger 3|.

At the upper end of the column 35, there is a yoke id which pivotallycarries an upper actuating lever ll, the lever being pivoted at one ends to project horizontally across the plunger 3! toward the rear of themachine. This lever i! is biased upwardl by a spring 5| against a fixedstop 62 and carries a thumb screw 53, which extends downwardly throughthe lever into engagement with the top 39 of the plunger. A loweractuating lever 55 extends from the presser foot i2 generallyhorizontally beneath the other lever 61. The lower lever is alsospring-biased upwardly at 6!, and a thumb screw 51 carried by a bracket59 on the fixed column 35 limits upward movement of the lever.

It will be noted that the column 35 is carried upon an arm 63, whichprojects upwardly and then forwardly from the back of the machine.

As shown more particularly in.

.4 This arm also supports certain treadle-operated mechanism; and theupper-lever stop 52 as well as a hook 65 for the spring 6| are mountedthereon.

The treadle-operated mechanism includes at least one and preferably twovertically movable members 6'! and 69, which in turn carry certainadjustable lever-engaging elements. In the disclosed embodiment, themembers 6'! and 69 are bars slidably mounted within a fixed guideway Hand retained therein by a cover plate 13. Arms 15 and H projectingrearwardly from the bars Bi and 69, respectively, and springs 19 and 8|,respectively, are secured between these arms and a support 83 fixed onthe guideway. As such, the bars are biased to predetermined retractedpositions, wherein shoulders 85 thereon engage the fixed guideway H, butare movable to predetermined actuated positions wherein shoulders 86 attheir tops engage the upper surface of the guideway. In order tofacilitate actuation of the bars, treadles 8! and. 89 located beneaththe work bench are connected to the bars 61 and 69 through lines 9! and93, respectively. These lines extend from the treadles about pulleys andthrough the table to the arms 15 and H.

Each bar also has an upper foot 91 projecting over the upper lever i?and a lower foot 99, which extends over the lower actuating lever 55.Thumb screws are threaded through the feet in position for engagementwith the levers; there being screws HH and M2 at the top and bottom ofthe bar 6? and screws I03 and H3 at the top and bottom of the other bar69. Locking nuts I05 may also be employed in conjunction with screws, asshown.

Operation of the machine is as follows: The position of the knife isrelatively fixed and the feed roller H is adjusted through mechanism(not shown) so as to be clear of the presser foot I2. Necessarily, thefeed roller moves downwardly against its bias as material is fed beneaththe presser foot up against a rear guide I01, which is preferablycarried by the presser foot.

Initially, the thumb screw 53 at the top of the plunger is adjusted toprovide a predetermined relatively large space between th bottom guidesurface 29 of the presser foot and the cutting part 9 of the knife. Theamount of this space determines the depth of the initial cut made by themachine. The angle of the presser foot may then be adjusted at the thumbscrew 51 in order to make a relatively shallow or flat out. This generalarrangement of the parts and the cut made thereby are shown in Fig. 4 ofthe drawings, the effect being somewhat exaggerated. The out shown is ofa type particularly useful in folding over and hemming, as along the topof a shoe upper.

The machine is prepared for making a different cut by manipulation ofone of the treadles, for example, treadle 81. In this case, the screwsHll and I62 for the associated bar 6'! are adjusted so that when thetreadle is operated and the bar moved from its predetermined retractedposition to its predetermined actuated position, one or both of thelevers l1 and 55 will be actuated. Lever 4'! lowers the presser headwhereas lever 55 increases the angle of the presser head and slope ofthe out. As shown in Fig. 5, for example, the presser head may belowered a slight amount and the presser foot adjusted to a slight anglein order to make a relatively gentle sloping cut.

The other treadle 89 and associated bar 89 are manipulated to preparethe machine for a still difierent type of out. In this case, the screwsI03 and l 114 may be adjusted to project relatively further than thescrews HM and W2, so that the levers 41 and '5 5 are moved an additionalamount. As shown in Fig. 6, for example, the angle of the presser footis increased in order to make a relatively steep bevel.

From the foregoing description, it will be apparent that a blank ofleather requiring several different marginal cuts, such as that used inmaking the shoe upper, may be quickly and conveniently finished on asingle machine. For example, the upper margin of the blank is passedthrough the machine to make a splitting cut for hemming the edge; one ofthe treadles is actuated and the blank is rotated on the top of themachine to prepare for skiving the bottom margin of the blank in orderto provide a beveled scarf for securing the quarter to the vamp; andthen the other treadle is actuated and the blank rotated again in orderto pass the back margin of the blank through the machine, thereby makinga steep bevel cut for forming a heel part of the upper. Three differentcuts are made thus while the blank is hardly lifted from the machine.Moreover, any one or all of the three cuts can be conveniently varied byadjustment of the thumb screws.

Whereas one embodiment of the machine has been disclosed in detail,those skilled in the art should understand that the invention is notlimited thereto, but the drawings and description thereof are to beunderstood as being merely illustrative. For example, instead of thesliding bar and guideway arrangement disclosed herein, there may bepivoted members which carry the adjustable lever-engaging elements. Itis realized that many modifications and variations will presentthemselves to those skilled in the art without departing from the spiritof this invention or the scope thereof as set forth in the appendedclaims.

Having thus described the invention, what is claimed and desired to besecured by Letters Patent is:

1. In a skiving machine of the type wherein the work piece is fedagainst a rotary knife from between a feed roller and a presser foot,which foot is pivotally mounted upon a vertically movable support; theimprovement comprising a first actuating lever for moving saidpresserfoot support to vary the elevation of the presser foot withrespect to the cutting knife, a second actuating lever coupled to thepresser foot to vary the angle thereof with respect to the cuttingknife, and at least one treadle-actuated member, said member beingmovable from a retracted position to a predetermined actuated position,and said treadle-actuated member having first and second lever-actuatingelements which are adjustably positionable thereon to engage therespective actuating levers at variable points during the movement ofthe treadle-actuated member to its predetermined actuated position.

2. Apparatus as set forth in claim 1 further including a secondtreadle-actuated member movable from a retracted position to apredetermined actuated position, said second member also havinglever-actuating elements which are adjustably positionable thereon toengage the respective levers at varying points during the movement ofthe member to its predetermined actuated position.

3. In a skiving machine of the type wherein the work piece is fedagainst a rotary knife from between a feed roller and a presser foot,which foot is pivotally mounted upon a vertically movable support; anupper actuating lever movable vertically and coupled to said support todepress the presser foot, a lower actuating lever coupled to pivot thepresser foot, and at least one slide mounted for vertical movementadjacent the free ends of said actuating levers, a treadle for movingsaid slide from an upper position to a predetermined lower position, andsaid slide having upper and lower lever-actuating elements which areadjustably positionable on the slide to engage the upper and lower1evers at varying points during movement of the slide to itspredetermined lower position.

4. Apparatus as set forth in claim 3 further including a second slidemounted for vertical movement adjacent the free ends of the actuatinglevers, a second treadle for moving said second slide from an upperposition to a. predetermined lower position, and said second slidehaving upper and lower lever-actuating elements which are adjust-ablypositionable on the silde to engage the upper and lower levers atvarying points during movement of the slide to its predetermined lowerposition.

5. Apparatus as set forth in claim 3 wherein said bar has feetprojecting over the respective levers and wherein the lever-actuatingelements are thumb screws threaded through said feet.

6. Apparatus as set forth in claim 3 wherein .the movable support forthe presser foot is spring biased upwardly and includes means foradjustably presetting the upper position of the support.

7. Apparatus as set forth in claim 3 wherein the lower actuating memberis spring biased upwardly and wherein the apparatus includes adjustablemeans for presetting the upper position of the lower actuating element.

8. Apparatus as set forth in claim 3, wherein said slide member isspring biased upwardly.

9. In a skiving machine of the type wherein the work piece is fedagainst a rotary knife from between a feed roller and a presser foot;the improvement comprising treadle-actuated mechanism for changing theangle of the presser foot relative to the knife, said mechanismincluding a member for actuating the presser foot, a second memberarranged for treadle actuation, and a lost-motion connection betweensaid first member and said treadle-actuated member.

10. Apparatus as set forth in claim 9, further including a third memberfor changing the spacing between the presser foot and the knife, and alost-motion connection between said third member and saidtreadle-actuated member.

11. Apparatus as set forth in claim 10, wherein said lost-motionconnections are constituted by adjustable elements carried by thetreadle-actuated member for engagement with said other members.

12. Apparatus as set forth in claim 9, wherein the presser foot ispivotally mounted upon a support by means of a pivot pin and a ballthrust bearing.

No references cited.

